r5:

[php5-apc.git] / apc_pthreadmutex.c

diff --git a/apc_pthreadmutex.c b/apc_pthreadmutex.c
new file mode 100644 (file)
index 0000000..e3b2c26
--- /dev/null
+++ b/apc_pthreadmutex.c
@@ -0,0 +1,111 @@
+/*
+  +----------------------------------------------------------------------+
+  | APC                                                                  |
+  +----------------------------------------------------------------------+
+  | Copyright (c) 2006 The PHP Group                                     |
+  +----------------------------------------------------------------------+
+  | This source file is subject to version 3.01 of the PHP license,      |
+  | that is bundled with this package in the file LICENSE, and is        |
+  | available through the world-wide-web at the following url:           |
+  | http://www.php.net/license/3_01.txt                                  |
+  | If you did not receive a copy of the PHP license and are unable to   |
+  | obtain it through the world-wide-web, please send a note to          |
+  | license@php.net so we can mail you a copy immediately.               |
+  +----------------------------------------------------------------------+
+  | Authors: Brian Shire <shire@php.net>                                 |
+  +----------------------------------------------------------------------+
+
+ */
+
+/* $Id: apc_pthreadmutex.c,v 3.3 2007/12/21 01:36:51 shire Exp $ */
+
+#include "apc_pthreadmutex.h"
+
+#ifdef APC_PTHREADMUTEX_LOCKS
+
+pthread_mutex_t *apc_pthreadmutex_create(pthread_mutex_t *lock) 
+{ 
+    int result;
+    pthread_mutexattr_t* attr;
+    attr = malloc(sizeof(pthread_mutexattr_t));
+
+    result = pthread_mutexattr_init(attr);
+    if(result == ENOMEM) {
+        apc_eprint("pthread mutex error: Insufficient memory exists to create the mutex attribute object.");
+    } else if(result == EINVAL) {
+        apc_eprint("pthread mutex error: attr does not point to writeable memory.");
+    } else if(result == EFAULT) {
+        apc_eprint("pthread mutex error: attr is an invalid pointer.");
+    } 
+
+#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
+       result = pthread_mutexattr_settype(attr, PTHREAD_MUTEX_ADAPTIVE_NP);
+       if (result == EINVAL) {
+               apc_eprint("pthread_mutexattr_settype: unable to set adaptive mutexes");
+       }
+#endif
+
+    /* pthread_mutexattr_settype(attr, PTHREAD_MUTEX_ERRORCHECK); */
+    result = pthread_mutexattr_setpshared(attr, PTHREAD_PROCESS_SHARED);
+    if(result == EINVAL) {
+        apc_eprint("pthread mutex error: attr is not an initialized mutex attribute object, or pshared is not a valid process-shared state setting.");
+    } else if(result == EFAULT) {
+        apc_eprint("pthread mutex error: attr is an invalid pointer.");
+    } else if(result == ENOTSUP) {
+        apc_eprint("pthread mutex error: pshared was set to PTHREAD_PROCESS_SHARED.");
+    }
+
+    if(pthread_mutex_init(lock, attr)) { 
+        apc_eprint("unable to initialize pthread lock");
+    }
+    return lock;
+}
+
+void apc_pthreadmutex_destroy(pthread_mutex_t *lock)
+{
+    return; /* we don't actually destroy the mutex, as it would destroy it for all processes */
+}
+
+void apc_pthreadmutex_lock(pthread_mutex_t *lock)
+{
+    int result;
+    result = pthread_mutex_lock(lock);
+    if(result == EINVAL) {
+        apc_eprint("unable to obtain pthread lock (EINVAL)");
+    } else if(result == EDEADLK) {
+        apc_eprint("unable to obtain pthread lock (EDEADLK)");
+    }  
+}
+
+void apc_pthreadmutex_unlock(pthread_mutex_t *lock)
+{
+    if(pthread_mutex_unlock(lock)) {
+        apc_eprint("unable to unlock pthread lock");
+    }
+}
+
+zend_bool apc_pthreadmutex_nonblocking_lock(pthread_mutex_t *lock)
+{
+    int rval;
+    rval = pthread_mutex_trylock(lock);
+    if(rval == EBUSY) {     /* Lock is already held */
+        return 0;
+    } else if(rval == 0) {  /* Obtained lock */
+        return 1;
+    } else {                /* Other error */
+        apc_eprint("unable to obtain pthread trylock");
+        return 0;
+    }
+}
+
+
+#endif
+
+/*
+ * Local variables:
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ * vim600: expandtab sw=4 ts=4 sts=4 fdm=marker
+ * vim<600: expandtab sw=4 ts=4 sts=4
+ */